Spirometry is measured according to the recommendations for preschool children [2], with a commercial ZAN100 Spirometer situated in the pediatric pulmonary laboratory, by a skilled technician. Measurements are performed in the standing position, without nose-clip (for comfort of the child) until two consecutive technically acceptable curves are achieved. After the free-run, spiroetmry is measured in duplicate sets at 1, 3, 5, 10 and 20 minutes post-exercise [1]. The better of the two curves is selected as the representative value at each interval, but differences between the two values of FEV1 has to be <5%. The following signs are monitored by the pulmonologist: wheeze and prolonged expiration on auscultation over the trachea and two zones of both lungs (upper front and lower back). Cough, shortness of breath, or perceived breathlessness within 20 minutes after the run were noted.